Modified selective mapping based on squaring construction

2021 ◽  
Author(s):  
Hsin‐Ying Liang
Keyword(s):  
Selective Mapping

scholarly journals Noninvasive neuromodulation and thalamic mapping with low-intensity focused ultrasound

2018 ◽  
Vol 128 (3) ◽  
pp. 875-884 ◽  
Author(s):  
Robert F. Dallapiazza ◽  
Kelsie F. Timbie ◽  
Stephen Holmberg ◽  
Jeremy Gatesman ◽  
M. Beatriz Lopes ◽  
...  
Keyword(s):  
Focused Ultrasound ◽  
Thalamic Nucleus ◽  
Acoustic Energy ◽  
Similar Degree ◽  
Thalamic Nuclei ◽  
Low Intensity ◽  
Tissue Heating ◽  
The Central Nervous System ◽  
Selective Mapping ◽  
Noninvasive Neuromodulation

OBJECTIVEUltrasound can be precisely focused through the intact human skull to target deep regions of the brain for stereotactic ablations. Acoustic energy at much lower intensities is capable of both exciting and inhibiting neural tissues without causing tissue heating or damage. The objective of this study was to demonstrate the effects of low-intensity focused ultrasound (LIFU) for neuromodulation and selective mapping in the thalamus of a large-brain animal.METHODSTen Yorkshire swine (Sus scrofa domesticus) were used in this study. In the first neuromodulation experiment, the lemniscal sensory thalamus was stereotactically targeted with LIFU, and somatosensory evoked potentials (SSEPs) were monitored. In a second mapping experiment, the ventromedial and ventroposterolateral sensory thalamic nuclei were alternately targeted with LIFU, while both trigeminal and tibial evoked SSEPs were recorded. Temperature at the acoustic focus was assessed using MR thermography. At the end of the experiments, all tissues were assessed histologically for damage.RESULTSLIFU targeted to the ventroposterolateral thalamic nucleus suppressed SSEP amplitude to 71.6% ± 11.4% (mean ± SD) compared with baseline recordings. Second, we found a similar degree of inhibition with a high spatial resolution (∼ 2 mm) since adjacent thalamic nuclei could be selectively inhibited. The ventromedial thalamic nucleus could be inhibited without affecting the ventrolateral nucleus. During MR thermography imaging, there was no observed tissue heating during LIFU sonications and no histological evidence of tissue damage.CONCLUSIONSThese results suggest that LIFU can be safely used to modulate neuronal circuits in the central nervous system and that noninvasive brain mapping with focused ultrasound may be feasible in humans.

Partial Selective Mapping OFDM with Low Complexity IFFTs

2008 ◽  
Vol 12 (1) ◽  
pp. 4-6 ◽  
Author(s):  
A. Ghassemi ◽  
T.A. Gulliver
Keyword(s):  
Low Complexity ◽  
Selective Mapping

scholarly journals An Improved Selective Mapping Method for PAPR Reduction in OFDM/OQAM System

2013 ◽  
Vol 05 (03) ◽  
pp. 53-56 ◽  
Author(s):  
Guobing Cheng ◽  
Huilei Li ◽  
Binhong Dong ◽  
Shaoqian Li
Keyword(s):  
Mapping Method ◽  
Papr Reduction ◽  
Selective Mapping

Time domain cyclic selective mapping for PAPR reduction in MIMO-OFDM systems

2018 ◽  
Author(s):  
Panca Dewi Pamungkasari ◽  
Ilmiawan Shubhi ◽  
Filbert H. Juwono ◽  
Prita Dewi Mariyam ◽  
Dadang Gunawan
Keyword(s):  
Time Domain ◽  
Papr Reduction ◽  
Ofdm Systems ◽  
Mimo Ofdm ◽  
Selective Mapping

scholarly journals A Hybrid PAPR Reduction Method Based on SLM and Multi-Data Block PTS for FBMC/OQAM Systems

Information ◽  
2018 ◽  
Vol 9 (10) ◽  
pp. 246 ◽  
Author(s):  
Han Wang
Keyword(s):  
Communication Systems ◽  
Filter Bank ◽  
Reduction Method ◽  
Average Power ◽  
Data Block ◽  
Papr Reduction ◽  
Wireless Communication Systems ◽  
Transmission Scheme ◽  
Filter Bank Multicarrier ◽  
Selective Mapping

The filter bank multicarrier employing offset quadrature amplitude modulation (FBMC/OQAM) is a candidate transmission scheme for 5G wireless communication systems. However, it has a high peak-to-average power ratio (PAPR). Due to the nature of overlapped signal structure of FBMC/OQAM, conventional PAPR reduction schemes cannot work effectively. A hybrid PAPR reduction scheme based on selective mapping (SLM) and multi data block partial transmit sequence (M-PTS) methods is proposed for FBMC/OQAM signals in this paper. Different from the simple SLM-PTS method, the proposed hybrid algorithm takes into account the overlapping effect of multiple adjacent data blocks on its PTS process. From simulation results, it can be obtained that the proposed method can offer a significant PAPR reduction performance improvement compared with the SLM, PTS and SLM-PTS methods. The proposed method can effectively reduce the PAPR in FBMC/OQAM systems.

Sign in / Sign up

Export Citation Format

Share Document